CA1039209A - Double-walled tube and a method of producing thereof - Google Patents
Double-walled tube and a method of producing thereofInfo
- Publication number
- CA1039209A CA1039209A CA000234387A CA234387A CA1039209A CA 1039209 A CA1039209 A CA 1039209A CA 000234387 A CA000234387 A CA 000234387A CA 234387 A CA234387 A CA 234387A CA 1039209 A CA1039209 A CA 1039209A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- section
- double
- walled
- lid section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosure describes a method for producing a double-walled tube by inserting a core into a double-walled tube body having a shoulder and a mouth section. The tube body consists of a thermoplastic inner tube member which has a trumpet-shaped top section, and a thin-walled outer tube member made of metal.
The core has an outer configuration corresponding to the inner configuration of the tube body. The exterior of the core is closed with plugs having an inner configuration corresponding to the outer configuration of a lid section to be formed on at least the top portion of the tube body, thereby defining a cavi-ty to mold the lid section in which the trumpet-shaped top sec-tion of the inner tube member is protruded into the cavity.
Finally, a molten thermoplastic resin is injected into the cavity whereby the lid section is formed on at least the top portion of the tube and is integrally rigidly connected to the trumpet-shaped top section of the inner tube member of the tube. The disclosure also describes a double-walled tube made by this method.
The disclosure describes a method for producing a double-walled tube by inserting a core into a double-walled tube body having a shoulder and a mouth section. The tube body consists of a thermoplastic inner tube member which has a trumpet-shaped top section, and a thin-walled outer tube member made of metal.
The core has an outer configuration corresponding to the inner configuration of the tube body. The exterior of the core is closed with plugs having an inner configuration corresponding to the outer configuration of a lid section to be formed on at least the top portion of the tube body, thereby defining a cavi-ty to mold the lid section in which the trumpet-shaped top sec-tion of the inner tube member is protruded into the cavity.
Finally, a molten thermoplastic resin is injected into the cavity whereby the lid section is formed on at least the top portion of the tube and is integrally rigidly connected to the trumpet-shaped top section of the inner tube member of the tube. The disclosure also describes a double-walled tube made by this method.
Description
~39~
:~ ~
The present invention relates to a double-walled tube, .
formed of a plastic-made inner tube and metal-made outer tube, to contain creamy fluid for practical and other applications, and a method of producing the same.
An object of the present invention is to provide a novel double-walled tube of a plastic-made inner tube and a metal made outer tube in which a plastic-made lid section is integrally formed on the opened-top of the previously made double-walled tube by means of injection molding, and a method for producing the same on an industrial scale.
Another object of the invention is to provide double-walled tube having plastic-made lid section at opened-top thereof, the plastic lid section acting as a packing so as to prevent leakage of fluid material conta.ined in the tube when a cap is set on the tube.
Still another object of the present invention is to provide a double-walled tube having merits of both a metallic tube and a plastic tube. ~ -Other objects and advantages of the present invention will appear from the following detailed description and certain preferred embodiments of the invention in which: ~ :
Figure 1 is a vertical cross section of the essential portion of a tube according to the present invention.
Figure 2 is a vertical cross section showing the essential portion of a metal mold used in the production of the tube shown in Figure 1 and illustrating the function thereof.
Figure 3 is a vertical cross section of the essential portion of another embodiment of the inventive tube, and ~
Figure 4 is a vertical cross section showing the ;.
essential portion of a metal mold used in the production of the tube shown in Figure 3. :
Referring now to Figure 1, one embodiment of a tube ~{~3~3f~0~
according ko the present inven-tion is indica-ted by reference numeral 10.
The tube 10 comprised of a double-walled tube body 11 having a shoulder 12 and a top-opened mouth section 13 which '`
is provided with an external thread 17 and a plastlc-made lid section 14 formed on the top portion of the mouth section 13 ~ ;
in connection therewith by means of injection molding.
Said double-walled tube body comprises a plastic ~
inner tube member 15 and a metal-made outer tube member 16, ~ ;
and said inner tube member 15 is provided with trumpet-shaped top section 18 on the opened-top thereof. The trumpet-shaped top section 18 is buried in the matrix of the lid section 14, so that the inner tube member 15 and the lid section are inte~
grally rigidly connected under gap-less conditionstherebetween.
From the aforementioned construction, it will be understood that the material to be contained in the tube may be perfectly protected from contact with outer metal-made tube member 16 -thereby preventing the material in the tube from being ad-versely affected by t,he metal material, and the plastic-made `~
lid section 14 positioned on the top of the tube acts as a pac}cing when a cap (not shown~ is situated on the mouth sec- ~ ?
tion of the tube, thereby maintaining the interior of the tube air tight and preventing leakage of material contained in the tube.
Referring now to Figure 2, there is shown a typical construction of metal mold by which the production of the -above tube shown in Figure 1 is performed. The metal mold consists of a core 19 which is movable vertically and three sets of plugs 20, 20, 21, and 22, 22. Said core consists of a cylindrical body having an inner configuration corresponding to the outer configuration of the tube body 11 of the tube to be molded. The said plugs 20, 20 and 22, 22 are of split type ;
1~39~09 openable to the left and right respectively, as viewed in the ~igure. The said plug 21 is also of split type and is movable vertically. The plug 21 is provided with a cavity 23 corres-ponding to the shape of the lid section 1~ and has a sprue runner 24 formed therein which is communicating with the cavity ~ -23 through a pin-point gate 25. The cavity 23 is defined by assembly of the core with tube body 11, the plug 20, 20 and the plug 21.
The metal mold described above is operated as follows.
Namely, the plugs 20, 20 and 22, 22 are opened respectively in the respective directions of the arrows in Figure 2 and the core 19 is moved in a downward direction. Then, the double-walled ;~
tube body 11 which is previously formed is fitted around the core 19, and the plugs are moved back into a closed state shown in the figure, forming a desired cavity 23. In this state, the trumpet-shaped top section 18 is positioned in the cavity 23. A molten resin is injected into the cavity 23 from the sprue runner 24 through the gate 2S. The molten resin is al-lowed to harden by cooling during a specified period of time, and thus the lid section is formed on the top portion of the double-walled tube body 11 under integral connection with the trumpet- -shaped top section 18 of the plastic-made inner tube member 15 of the tube body 11. Finally, each plug is opened again in the direction of the arrows to its original position and the completed tube is removed from the core l9. -The figures to which reference was had in the foregoing description are, of course, diagrammatic views and in no way represent the actual mold. The design of the mold, which is shown diagrammatically in the figures, will obviously be modified somewhat when it is to be put to practical use. Such design changes obviously include, for example, the provision of pusher pins in the core 19 along the axis thereof for easing the re-'' . ~ ''' .
1 . '., ~ . ' ' .' ' ' ' ~' ~V3Yi~2~9 moval of the molded tube from said core and further formation of pressure fluid passages in said core for automatically blowing off the molded tube from said core upon completion of the molding.
Referring to drawing 3, another embodiment of a tube according to the present invention is shown by the numeral 26.
In this tube, a plastic~made lid section 27 is integrally extended around a mouth section 28 and a shoulder section 29 of the tube, and an external thread 34 is formed around the lid section. A double-walled tube body 30 consists of, as similar to the aforementioned tube shown in Figure 1, a plastic-made inner tube 31 which has a trumpet~shaped top section 44 and , a metal-made outer tube 32, and the trumpet~shaped top section 33 is integrally buried in the lid section 27. ~ number of vertical slits 33 are formed on the outer cylindrical surface of the mouth section of the metal-made outer tube 32 for ri-gidly connecting the lid section. From this construction of the tube, it will be understood that, in addition to effects similar to that of the aforementioned tube 10 shown in Figure 1, the mouth and shoulder sections of the tube 26 are considerably reinforced by the extended lid section 27, thereby preventing twisting of the mouth portion when the cap is screwed onto the thread 34.
Figure 4 shows a metal mold 35 for producing the tube 26. The metal mold cornprises a core 36 which is vertically movable and four sets of plugs 37, 38, 38, 39 and 40, 40. Said core consists of a cylindrical body having an inner configuration corresponding to the outer configuration of the tube body 30 of the tube to be molded. The said plug 38, 38 is of split type and openable to the left and righ-t respectively. The plug 39, is also of split type and is openable vertically. The plug 40, 40 is also of split type and openable to the left and right '~' ' i :
.' ' . . . ' ,.' ' . ' ~ ' '. . . ~ ' . ~ !
respectively. The plug 37 is of split type and openable verti~
cally. Said plugs 37, 38, 38 and 39, 39 define a cavity 41 be-tween the inner surfaces of the plugs and the shoulder and mouth sections of the tube to be fitted on the core 36, said cavity being provided with a configuration the same as that of the lid section 27. The said plug 37 has a sprue runner 42 formed '~ -therein which communicates with the cavity 41 through a pin~
point gate 43. - `-The metal mold described above is operated as follows.
The plugs 37, 38, 38; 39 and 40, 40 are opened respectively in the respective direction of the arrows in Figure 4 and the core ' , "~
36 is moved down. Then, double-walled tube body 30, which has been previously formed, is fitted around the core 36, and the plugs are moved back to their closed condit.ion as in Figure 4.
A molten resin is injected into the cavity ~1 from the gate 43.
. ::
The molten resin is allowed to harden by cooling for a speci-fied period of time, thus forming the lid section 27 around the -top portion, the outer cylindrical surface of the mouth section ~
28, and the shoulder section 29 o E the tube 26, the lid section ;
27 being integrally connected to the trumpet-shaped top section 44 of the plastic-made inner tube member 31. Finally, each plug is opened again and the completed tube is removed from the core 36.
The inner tube member of the tube according to the present invention may be produced with any thermoplastic resin which lS presently available or will be made available in the future. The type of resin to be used may be selected based primarily on the characteristics of a product to be contained `~
in the tube. In this case, it lS to be noted that the resins to be used for the formation of the inner tube and the lid sec- ~;
tion are not necessarily the same but any resins adhesive to each other may be used.
-5~
, .
. ,, . . - ., , ~
~039~
Although the present invention has been described and :;
illustrated in terms of particular embodiments thereof, it should be understood that this is by way of illustration only and the invention is not limited thereto.
:~ ~
The present invention relates to a double-walled tube, .
formed of a plastic-made inner tube and metal-made outer tube, to contain creamy fluid for practical and other applications, and a method of producing the same.
An object of the present invention is to provide a novel double-walled tube of a plastic-made inner tube and a metal made outer tube in which a plastic-made lid section is integrally formed on the opened-top of the previously made double-walled tube by means of injection molding, and a method for producing the same on an industrial scale.
Another object of the invention is to provide double-walled tube having plastic-made lid section at opened-top thereof, the plastic lid section acting as a packing so as to prevent leakage of fluid material conta.ined in the tube when a cap is set on the tube.
Still another object of the present invention is to provide a double-walled tube having merits of both a metallic tube and a plastic tube. ~ -Other objects and advantages of the present invention will appear from the following detailed description and certain preferred embodiments of the invention in which: ~ :
Figure 1 is a vertical cross section of the essential portion of a tube according to the present invention.
Figure 2 is a vertical cross section showing the essential portion of a metal mold used in the production of the tube shown in Figure 1 and illustrating the function thereof.
Figure 3 is a vertical cross section of the essential portion of another embodiment of the inventive tube, and ~
Figure 4 is a vertical cross section showing the ;.
essential portion of a metal mold used in the production of the tube shown in Figure 3. :
Referring now to Figure 1, one embodiment of a tube ~{~3~3f~0~
according ko the present inven-tion is indica-ted by reference numeral 10.
The tube 10 comprised of a double-walled tube body 11 having a shoulder 12 and a top-opened mouth section 13 which '`
is provided with an external thread 17 and a plastlc-made lid section 14 formed on the top portion of the mouth section 13 ~ ;
in connection therewith by means of injection molding.
Said double-walled tube body comprises a plastic ~
inner tube member 15 and a metal-made outer tube member 16, ~ ;
and said inner tube member 15 is provided with trumpet-shaped top section 18 on the opened-top thereof. The trumpet-shaped top section 18 is buried in the matrix of the lid section 14, so that the inner tube member 15 and the lid section are inte~
grally rigidly connected under gap-less conditionstherebetween.
From the aforementioned construction, it will be understood that the material to be contained in the tube may be perfectly protected from contact with outer metal-made tube member 16 -thereby preventing the material in the tube from being ad-versely affected by t,he metal material, and the plastic-made `~
lid section 14 positioned on the top of the tube acts as a pac}cing when a cap (not shown~ is situated on the mouth sec- ~ ?
tion of the tube, thereby maintaining the interior of the tube air tight and preventing leakage of material contained in the tube.
Referring now to Figure 2, there is shown a typical construction of metal mold by which the production of the -above tube shown in Figure 1 is performed. The metal mold consists of a core 19 which is movable vertically and three sets of plugs 20, 20, 21, and 22, 22. Said core consists of a cylindrical body having an inner configuration corresponding to the outer configuration of the tube body 11 of the tube to be molded. The said plugs 20, 20 and 22, 22 are of split type ;
1~39~09 openable to the left and right respectively, as viewed in the ~igure. The said plug 21 is also of split type and is movable vertically. The plug 21 is provided with a cavity 23 corres-ponding to the shape of the lid section 1~ and has a sprue runner 24 formed therein which is communicating with the cavity ~ -23 through a pin-point gate 25. The cavity 23 is defined by assembly of the core with tube body 11, the plug 20, 20 and the plug 21.
The metal mold described above is operated as follows.
Namely, the plugs 20, 20 and 22, 22 are opened respectively in the respective directions of the arrows in Figure 2 and the core 19 is moved in a downward direction. Then, the double-walled ;~
tube body 11 which is previously formed is fitted around the core 19, and the plugs are moved back into a closed state shown in the figure, forming a desired cavity 23. In this state, the trumpet-shaped top section 18 is positioned in the cavity 23. A molten resin is injected into the cavity 23 from the sprue runner 24 through the gate 2S. The molten resin is al-lowed to harden by cooling during a specified period of time, and thus the lid section is formed on the top portion of the double-walled tube body 11 under integral connection with the trumpet- -shaped top section 18 of the plastic-made inner tube member 15 of the tube body 11. Finally, each plug is opened again in the direction of the arrows to its original position and the completed tube is removed from the core l9. -The figures to which reference was had in the foregoing description are, of course, diagrammatic views and in no way represent the actual mold. The design of the mold, which is shown diagrammatically in the figures, will obviously be modified somewhat when it is to be put to practical use. Such design changes obviously include, for example, the provision of pusher pins in the core 19 along the axis thereof for easing the re-'' . ~ ''' .
1 . '., ~ . ' ' .' ' ' ' ~' ~V3Yi~2~9 moval of the molded tube from said core and further formation of pressure fluid passages in said core for automatically blowing off the molded tube from said core upon completion of the molding.
Referring to drawing 3, another embodiment of a tube according to the present invention is shown by the numeral 26.
In this tube, a plastic~made lid section 27 is integrally extended around a mouth section 28 and a shoulder section 29 of the tube, and an external thread 34 is formed around the lid section. A double-walled tube body 30 consists of, as similar to the aforementioned tube shown in Figure 1, a plastic-made inner tube 31 which has a trumpet~shaped top section 44 and , a metal-made outer tube 32, and the trumpet~shaped top section 33 is integrally buried in the lid section 27. ~ number of vertical slits 33 are formed on the outer cylindrical surface of the mouth section of the metal-made outer tube 32 for ri-gidly connecting the lid section. From this construction of the tube, it will be understood that, in addition to effects similar to that of the aforementioned tube 10 shown in Figure 1, the mouth and shoulder sections of the tube 26 are considerably reinforced by the extended lid section 27, thereby preventing twisting of the mouth portion when the cap is screwed onto the thread 34.
Figure 4 shows a metal mold 35 for producing the tube 26. The metal mold cornprises a core 36 which is vertically movable and four sets of plugs 37, 38, 38, 39 and 40, 40. Said core consists of a cylindrical body having an inner configuration corresponding to the outer configuration of the tube body 30 of the tube to be molded. The said plug 38, 38 is of split type and openable to the left and righ-t respectively. The plug 39, is also of split type and is openable vertically. The plug 40, 40 is also of split type and openable to the left and right '~' ' i :
.' ' . . . ' ,.' ' . ' ~ ' '. . . ~ ' . ~ !
respectively. The plug 37 is of split type and openable verti~
cally. Said plugs 37, 38, 38 and 39, 39 define a cavity 41 be-tween the inner surfaces of the plugs and the shoulder and mouth sections of the tube to be fitted on the core 36, said cavity being provided with a configuration the same as that of the lid section 27. The said plug 37 has a sprue runner 42 formed '~ -therein which communicates with the cavity 41 through a pin~
point gate 43. - `-The metal mold described above is operated as follows.
The plugs 37, 38, 38; 39 and 40, 40 are opened respectively in the respective direction of the arrows in Figure 4 and the core ' , "~
36 is moved down. Then, double-walled tube body 30, which has been previously formed, is fitted around the core 36, and the plugs are moved back to their closed condit.ion as in Figure 4.
A molten resin is injected into the cavity ~1 from the gate 43.
. ::
The molten resin is allowed to harden by cooling for a speci-fied period of time, thus forming the lid section 27 around the -top portion, the outer cylindrical surface of the mouth section ~
28, and the shoulder section 29 o E the tube 26, the lid section ;
27 being integrally connected to the trumpet-shaped top section 44 of the plastic-made inner tube member 31. Finally, each plug is opened again and the completed tube is removed from the core 36.
The inner tube member of the tube according to the present invention may be produced with any thermoplastic resin which lS presently available or will be made available in the future. The type of resin to be used may be selected based primarily on the characteristics of a product to be contained `~
in the tube. In this case, it lS to be noted that the resins to be used for the formation of the inner tube and the lid sec- ~;
tion are not necessarily the same but any resins adhesive to each other may be used.
-5~
, .
. ,, . . - ., , ~
~039~
Although the present invention has been described and :;
illustrated in terms of particular embodiments thereof, it should be understood that this is by way of illustration only and the invention is not limited thereto.
Claims (2)
1. A double-walled tube comprising a double-walled tube body having a shoulder, a top-opened mouth section and an in-jection-molded thermoplastic lid section formed on at least the top of the mouth section, said tube body consisting of a thermo-plastic-made inner tube member which has a trumpet-shaped top section and a thin-walled outer tube member made of metal, said trumpet-shaped top section being buried in the matrix of the lid section, whereby the inner tube member and the lid section are integrally rigidly connected under gap-less conditions there-between, and thereby protecting the fluid material contained in the tube from contact with the outer metal-made tube member, the lid section being formed on the top of the tube body.
2. A double-walled tube as claimed in claim 1, wherein the lid section is further extended around a mouth section and a shoulder section of the tube, and thread being formed around an outer cylindrical surface of said mouth portion of the lid section thereby considerably reinforcing the mouth and shoulder sections of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000234387A CA1039209A (en) | 1975-08-28 | 1975-08-28 | Double-walled tube and a method of producing thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000234387A CA1039209A (en) | 1975-08-28 | 1975-08-28 | Double-walled tube and a method of producing thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039209A true CA1039209A (en) | 1978-09-26 |
Family
ID=4103921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000234387A Expired CA1039209A (en) | 1975-08-28 | 1975-08-28 | Double-walled tube and a method of producing thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1039209A (en) |
-
1975
- 1975-08-28 CA CA000234387A patent/CA1039209A/en not_active Expired
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